#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    long long int a,b;
    cin>>a>>b;
    if (a>b)
          cout<<a-1+(b-1)*a;
    else
    cout<<b-1+(a-1)*b;
    
    return 0;
}